Drive mechanism



Lmss@ Nov. 4 1924.

2 Sheets-Sheet Filed Feb. 27. 1923 A v Z A 5 n A 1 .wrm Lkfr 2 w Y MMurwg) l A We. nnwnllhl A. M6.. .K .rl| u K 1 A. www I.\ f/M/ I 7 m WITNESSES A H05/ms O. LONDBERG DRIVE MECHANISM mvv', 4

Filelreb.; 27. 1923 2 Sheets-Sheet 2 @Car mbery [Irl E :ILV l l f WIT/VESSES III A TTURNEYS one.

OSCAR LONDBERG, F SKANEE, MICHIGAN.

DIR-IVE MECI-IANISM.

Application filed February 27, 1923. Serial No. 621,548.

To all whom 'it' may concern.' l through a portion of the structure exhibited 55 Be it known that I, OsoAn LoNDnnnG, a in Figure l, and citizen of the United States, and resident of Figure 3 is a perspective group view show- Skanee, in the county of Baraga and State ing certain of the elements exhibited in the 5 of Michigan, have invented certain new and preceding views in disassembled relation.

useful Improvements in Drive Mechanisms, ln Figure l I show a portion of the frame en of which the following is a specification. l of a sewing machine of ordinary construc- My invention relates to improvements in tion. 2 designates a drive wheel which is drive mechanisms for sewing and other masupported on the frame l for rotation about chines which are adapted to be operated by a horizontal axis in the usual manner, that is foot power, and it consists in the combinaby a stub shaft, not shown, which may be a 55 tions, constructions and arrangements herein bolt and which ordinarily extends inwardly described and claimed. from the side of a portion of the frame l An object of the invention is to provide an shown in Figure l at a determined disattachment for sewing machines of the class tance from the lower end of the frame. A described which is adapted to replace the treadle 3 is roclringly supported at the loweil 7o usual crank and connecting rod arrangement end of the frame, as is usual. It is usual in between the treadle and drive wheel of the Sewing machines of the class described and machine and which affords facilities for partially illustrated in Figure l to provide driving the machine in a forward direction a single connecting rod and crank arrangeatall times when the treadle is rocked, irment between the drive wheel 2 and the 75 respective of the direction of rocking movetreadle 3. Such an arrangement does not ment of the treadle. permit of regulation ofthe speed at which A further object of the invention is to the drive wheel will be rotated when the provide an attachment ofthe character detreadle is operated at a given speed and scribed which embodies means whereby the more over is unsatisfactory in that the drive 80 speed at which the sewing machine will be wheel may rotate in opposite directions, the driven when the treadle is operated at a con direction of rotation being determined by stant speed may be varied at will. the position of the crank at the time power A still further object of the invention is is applied to the treadle, and therefore it to provide an attachment of the character has been necessary prior to my invention 85 described which is adapted to be operatively to turn the fly wheel, of the machine by hand applied to the drive wheel of a sewing mato insure rotation of the drive wheely in the chine of the class described without any desired direction, to slacken the speed at changes in the usual construction of the which the machine will be driven to a desewing machine other than the removal of sirable rate, or to start the machine when 90 the parts for which the attachment is subthe drive wheel stops on center. stituted being required, and which affords The objectionable features thus enumeratfacilities for driving the drive wheel of the ed are avoided when an attachment embodysewing machine without any appreciable ing the invention is substituted for the usual noise. single connecting rod and crank arrange- 95 A still further object of the invention is to ment between the treadle and the drive wheel provide an attachment of the characterv deof a sewing machine of the class described. scribed which is simple in construction, An attachment embodying the invention strong and durable, economical to manufacin kthe form now preferred by rme includes ture and thoroughly practical commercially. a cylindrical block 4l having a peripheral 100 Other objects of the invention will be apflange 5 at one end thereof, the peripheral parent from the following description, conflange being shown as having radial eXtensidered in conjunction with the accompanysions 6 perforated at 7 adjacent to their-exing drawings, in whichtremities. The perforations 7 are adapted Figure l is a perspective view showing a to'receive hook bolts 8 whereby the block 105 sewing machine drive mechanism embodying e be clamped against the inner side of the invention, the drive ywheel 2 in axial alignment with Figure 2 is a relatively enlarged section the latter, the hook portions of the bolts S being arranged in engagement with the spokes 9 of the drive wheel.

The inner face ot the block 4, that is the lace contiguous to the drive wheel is inwardly dished at its center or formed with an axial recess as shown at 10 to accommodate the protruding head of the usual stub shaft or bolt, not shown, which supports the drive wheel. Cbviously the radial spaced apart extensions 6 may be omitted and an annular extension to the flange 5 may he provided in lieu ot the extensions 6 without departing from the spirit and scope or' the invention.

A pair or" driving rings 1l and 12 respectively are adapted to be slipped over the outer end of the block et and to be rotatably supported in juxtaposed relation in respect to each other upon the block et being held against axial displacement relativelyv to the block by the flange 54 and a retaining plate 13 which is secured in abutting relation to the outer tace of the block by a screw 14 extending through a central opening 15 in the retaining plate into threaded engagement With an axial socket 16 in the block. The retaining plate 13 is shown as being circular in forni and as beingr larger diainetrically than the adjacent portion ot tls-e block l so as to project beyond the peripheral edge ot such adjacent portion oi the block into abutting relation to the adjacent end ot' one of the rings 11 or 12. YVhile the rings 11 and 12 are thus held against any appreciable axial movement, these rings may rotate freely on the block without creating any appreciable friction between thewrelatively moving surfaces oi' the rings and the flange 5 and'retaining plate 13. j

Each of the rings 11 and 12 is formed with a pair of integral spaced apart out wardly extending radial ears 17, 17` provided with aligned apertures 18, 18 therethrough adjacent to their outer ends, the ears 1.7, 17 being located adjacent to one end ot al relatively large aperture 19 formed in each of the rings. A lever 20 which is substantiallj7 triangular or T-shaped in form is provided for each of the rings 11 and 12 and is pivotally supported by a pivot pin 21 extending through the aligned perforations 18, 18 oit the ears 17, 17 and through a transverse opening 22 formed through the stein or the interposed lever 2O adjacent to the juncture of the stern of the lever with thehead of said lever, whereby the head portion of the lever will be disposed in substantiallywparallel relation to thesadja'cent portion or the r`ng with .which the particular levery is associated, the head .portion of each lever being curved arcuately to conform. to the curvature of thel ring. "Vith the arrangement described one of the sides or branches of' the head of the lever overlies the aperture 19 in the ring on which the lever is supported and a shoe or friction block 23 is provided on the overlying branch or portion ot the head of the lever to depend within the aperture 1f).7 the shoe or Jfriction block being made rubber or like material and being of a thickness to extend through the aperture into frictional contact with the undcrlying portion ot' the block il when the lever 2O has been rocked in one direction about the axis of the pivot 21 and to discngage the underlying portion ot' the block i when the lever has been rocked in a direction opposite that lirst mentioned. The ei;- tent of rocking movement ot each lever 2O relatively to the ring` upon which supported fff 9.23 into engagement with the peripheral wall ci the supporting ring.

er connecting rod is provided for each ot the levers 20 and is pivotally connected7 as at 2t. with the outer end of the stein oi the lever at one et the ends or' the connecting E rod. llach connecting rod 25 is pivotallv connected at its other end. as at 27, to one ot the ends o a ar 28 which is clamped h v U-bolts or hook bolts 29 to the treadle 3. The bar is positioned at one end oi" the treadle and extends transversely et the latter, that is1l at right angles to the :wie about which the treadle is supported for ro` e' motion. The respective connectingv :la ot course are pivotally attached to opposite ends ol" the bar Q8 so that the roel:-

' oi the treadle will cause an upward n nioeinentof one connecting rod and a downward movement of the other.

From the foregoing description or" the various parte ot the device, the ope-ration thereoit iai' be rea-dik7 understood. The levers 20 are arranged on the rings l1 and' 12 so that the shoe cari-j ng sides or branches ot the heads ot the levers are lowerinost. Therefore, when the treadle 3 is rocked the upwardly moving connecting rod 25 will roch the lever E20 to which attached upwaivllj7 and the ring to which the upwardlyY rocked leve-r is attached will rotate on the block et independentlf.' oi the latter. the frio tion block or shoe of the upwardly roclred lever being ou 'lrictioiial engagement with the underlving potion ot the block l.

rlhe second lever ll be roclfed downwardly b v the downwai connec ing rod 25 coincidentallj Y with roclini' of the first mentioned lever upwardly. lThe friction shoe carried bv the downwardlv rocled 'lever will be pressed into ri'cibnol. engagement witl'i the und A.fing portion ot the lock and in consequence'the ring to which the dmvnwardly rocled lever islettached and the block 4 will be rotated as a unit, thus occas'ioning rotation or' the drive wheel 2 and opi-nation of the machine. rlhe speed at which the drive wheel 2 will be rotated when the treadle 8 is rocked at a given speed may be varied at will by manipulating the adjusting screws 24C to vary the ratio of the part of the downward stroke of each connecting rod expended in moving the friction block on the downwardly rocked lever into frictional engagement with the block d to the entire downward stroke of the connecting rod. That is to say, if the adjustment of the lever 2() in respect to the ring on which it is supported is such that twothirds of the distance traveled by a. connecting rod during its downward stroke is traversed before the friction block on the downwardly rocked lever is moved into frictional engagement with the block 4i, the drive wheel 2 will be rotated more slowly than if the adjustment of the lever in respect to the ring was suc-h that the friction block would be moved into frictional engagement with the block et atthe beginning of the downward stroke of the connectingrod.

The rings 1l and l2 are arranged on the block 4 so that rocking of the treadle will effect rotation of the drive wheel 2 in clockwise or forward direction. Each ofthe rings 12v may be weighted at points diametrically opposite the ears 17, 17 as by being` enlarged radially adjacent to said points. as indicated at 30 in Figure 2, wherebyv the return movement of these rings after each operating stroke will be accomplished with but very little if any power from the treadle being required.

To exert abralring action on the drive wheel, the connecting rod for the ring adjacent to the flange 5 may be pressed laterally by the knee of the operator, thus hold- .ing the ring in frictional engagement with the flange 5, whereby the speed of rotation of the drive wheel will be decelerated.

When operating a sewing machine having the usual crank-equipped belt wheel, the operator must keep one hand on the material which is being sewed and the other hand on the fly-wheel at the top of the machine to prevent the guiding mechanism of the machine from reversing and breaking the threada In starting such a machine, the operator must grasp the fly wheel and turn it since the position of the crank arm on the belt wheel at the time of starting is not known and unless the fly-wheel is grasped and turned, the driving mechanism may be moved in a backward direction and the thread broken. In order to accelerate the speed of the driving mechanism, the operator mustgrasp the fly-wheel since there is no other means for regulating the speed of the crank-equipped belt wheels of ordinary construction.

In other words, with such a machine, the

Gbviously, my invention is susceptible of n embodiment in forms other than that illusvtrated in the ,accompanying drawing, and I therefore consider as my own all modifications and adaptations of the form of the device herein disclosed which fairly fall within the scope of the appended claims.

Having thus described the invention, what l claim in 1. In a drive mechanism for sewing machines, the combination with the treadle and drive wheel, of a cylindrical block secured to the drive wheel in a-Xial alinement with the latter, a pair of juxtaposed driving rings rotatably disposed on the cylindrical block, each ring having an aperture formed through. the peripheral walls thereof, a rocker lever for each ring, the respect-ive rocher levers being pivotally supported on the corresponding rings in adjacent relation to the apertures in the latter, a friction shoe carried by each rocker lever in position to swing through one of said apertures into and out of frictional engagement with said block, connecting rods connecting the respective rocker levers with opposite sides of the treadle, and an adjusting screw carried by each rocker lever for engaging the ring with which the lever is associated` 2. In a drive mechanism for sewing machines, the combination with the treadle and drive wheel, of a cylindrical block having an annular ilange at one of its ends and being secured to the drive wheel in axial alignment with the latter and with the flanged end proximate to the drive wheel, a pair of juxtaposed driving rings rotatably mounted upon the cylindrical block and each having an aperture formed through the peripheral walls thereof, means carried by the block at the end thereof remote from the drive wheel for cooperating with said flange on the block to prevent axial displacement of the driving rings, a pair of reciprocable rods respectively connected at their lower end-s to opposite sides of the treadle and movable in opposite directions upon rocking of the treadle, a rocker lever pivotally attached at one end to the upper end of one of said reciprocable members and pivotally supported on one of said rings in adjacent relation to the aperture in the latter, a friction shoe carried by said lever in position to move through the aperture in the ring into and out of frictional engagement with Said block, and an adjnstingsere'w Carried by each lever for 'engaging the ring with which the lever is associated to control the rocking movement of the lever.

3. In a power transmission, a rotatable member of circular cross sectional contour, a pair of juxtaposed rings rotatably mounted on LSaid irst named rotatable member, ea'eh of said rings having an aperture formed through the peripheral Walls thereof, a rocker lever pvoted on each ring and having a portion adapted to be swung through the aperture of the ring into and out of fretional engagement with the peripheral Wall oit the first named rotatable 1 spective levers With opposite sides of a 20 treadle.

OSCAR LONDBERG. 

